Daily Max UV Forecast

Our hourly UV forecast calculations begin by using the predicted ozone layer thickness over a particular location as provided by Royal Netherlands Meteorological Institute (KNMI). We then take into account the angle of the sun which is dependent on latitude, season and time of the day. Finally, we apply the predicted hourly cloud cover and precipitation information to make the UV forecast for your location as accurate as possible.

Interpretation of the UV Index

Take precautions, such as covering up during midday hours, wearing a hat and sunglasses and using sunscreen. Stay in the shade near midday when the sun is strongest.

High

6-7

Wear sunglasses and use SPF 30+ sunscreen, cover the body with sun protective clothing and a wide-brim hat, and reduce time in the sun from three hours before to three hours after solar noon.

Very High

8-10

Wear SPF 30+ sunscreen, a shirt, sunglasses, and a hat. Do not stay out in the sun for too long.

Extreme

11+

Take all precautions, including: wear sunglasses and use SPF 30+ sunscreen, cover the body with a long-sleeve shirt and trousers, wear a very broad hat, and avoid the sun from three hours before until three hours after solar noon.